Find your nearest Farmers Market in Chicago area
Great web site dedicated to practical local eating. Forums, blogs, posts etc
http://www.thelocalbeet.com/category/features/
Chinese medicine talks about eating natural foods. Eating local is important to that dynamic if it is possible. With the internet we have a great resource to discover what is around out local areas.
I happen to share a meal with one of the main contributors to this site. He showed me Spoon Thai on Western near Wilson. Very good authentic Thai food!